Evaluation of Soybean Meal-Red Blood Cell Coextruded Feed Ingredient in Diets Fed to Rainbow Trout Oncorhynchus mykiss |
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| Authors: | George L Selden Jr Paul B Brown Anthony C Ostrowski Rolando A Flores Lawrence A Johnson |
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| Institution: | Purdue University, Department of Forestry and Natural Resources. 1159 Forestry Building, West Lafayette, Indiana 47907–1159 USA;Oceanic Institute, Makapuu Point, Waimanalo, Hawaii 96795 USA;Kansas State University, Department of Grain Science and Industry, Manhattan, Kansas 66506–2201 USA;Iowa State University. Center for Crops Utilization Research, Ames, Iowa 55011 USA |
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| Abstract: | Abstract.— Fish meal is one of the predominant sources of crude protein used in practical feeds for most cultured species. However, with overfishing and increasing demand for protein feedstuffs, new competitively priced sources of dietary protein are needed. A coextruded soybean meal-red blood cell (SBM-RBC) ingredient was evaluated as a source of crude protein for rainbow trout Oncorhynchus mykiss . The SBM-RBC ingredient was incorporated at either 0, 21, 42 or 63% of the dietary protein, replacing an isoni-trogenous amount of fish meal. All diets were fed for 8 wk to triplicate groups of juvenile rainbow trout (average initial weight 49.5 g) stocked into a recirculating system consisting of 48, 114-L aquaria. There were no significant differences in weight gain, feed conversion ratio, protein efficiency ratio, apparent crude protein digestibility, apparent gross energy digestibility, dress-out percentage, or fillet protein and fat concentrations in fish fed any of the experimental diets. Based on these data, extruded SBM-RBC appears to be a suitable ingredient in diets fed to rainbow trout. |
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